. >> on the floor of this baltimore factory, blair lazar brews a concoction of chili peppers. blair's death sauce. lazar first served hot sauce in 1989 as a young bartender trying to force lingering customers to leave at closing time. today, you can't keep them away. >> it's a way to suddenly feel different. everything is suddenly a little bit brighter. maybe a lot a bit brighter. >> his after hours spreermt morphed into an enterprise. in part fueled by exports. 40% of the bottles made by tabasco were sent overseas. for lazar, it's 75%. here at home, there's also the changing nature of american cuisine. as immigrants from asia and latin america introduced more of the culture to capsaicin. >> i was interested in why people would be interested in something that tasted so bad. like your mouth is going to peel off. >> capsaicin is the source of heat in all chili peppers. paul rossin has done the definitive work on why half the population wants it. >> if babies don't like it, animals hate it, why do some of us love it? >> well, there's a transformation that occurs, it occurs betwee